Welding machine



y c. EISLER 2,006,544

- a WELDING MACHINE Filed April 7, 1932 e Sheets- Sheet 1 y lmnnm i7/7759 W INVENTOR.

M iaafu/ W ATT NEYS.

July 2 1935. c. ElsLEl 2,006,544

I WELDING MACHINE Filed April 7 1932 6 Sheets-Sheet 2 July 2, 1935. c.EISLER 2,006,544

' WELDING momm- Filed April 7, 1952 s Sheets-Sheet s INVEIyTOR.

July 2, 1935. c. EISLER 2,005,544

WELDING MACHINE Filed April 7, 1952 6 Sheets-Sheet 4 July 2, 1935 c.EISLER 2,006,544

WELDING MACHINE Filed April '7, 1932 s Sheets-Sheet 5 IN V EN TOR.

y 1935- c. EisLER 2,006,544

VWELDING MACHINE Filed Ap ril 7, 1952 e Sheets-Sheet s INVENTOR.

Patented July 2, 1935 UNITED STATES PATENT OFFICE WELDING MACHINECharles Eisler, Newark,

N. J assignor to Eisler 3 Claims.

This invention relates to an improved welding machine for applyingwelding to sheets of metal and the like. It is automatic in itsoperation following a manual operation of a foot pedal or 5 itsequivalent.

The object of the invention is to provide a welding machine which can beoperated to give a single contact of the welding points to the workwhich ceases when the foot pedal is released and 10 also adapted foradjustment whereby repeated contacts are given in succession while thefoot pedal is operated.

Another object of the invention is to control the contacts and theelectric circuit to the end that the contacts engage the workand thenthe circuit is made and when or before the mechanical contact is brokenthe electric circuit is broken.

This insures safety from accident when the machine is not actuallywelding.

The invention also relates to certain details of construction which willbe more fully described hereinafter and also embodied in the claims.

The invention is illustrated in the accompanying drawings in whichFigure 1 is a view of the right side of a welding machine embodying myinvention. Figure 2 is a view of the left side of the machine shown inFigure 1. Figure 3 is a front view of the machine. Figure 4 is a rearview of the machine. Figure 5 is a detail section on line 5-5 in Figure4. Figure 6 is a side view of the machine broken away at the bottom andshown in section at the top. Figure 7 is a detail view of the contactspartly in section. Figure 8 is a section on line 88 in Figure 7. Figure9 is a side view of the bottom part of the machine with the trip of therepeating mechanism released.

Figure 10 is an enlarged detail side view of the control switch of thetransformer. Figure 11 is a vertical central section of Figure 10.Figure 12 is a diagrammatic elevation of the winding of the secondarycoil of the transformer. Figure 13 is a diagram of the wiring of thetransformer, switch and make-and-break device.

The machine comprises a suitable double standard l having a housing I Iat the top. The housing supports a contact point l2 on an arm l3. Thisarm is fixed. A second contact point I is secured by a clamp joint H8 tothe lever 15 ivoted at l 6 to the top of the housing and exten ing tothe rear as an arm l which includes a yokelike link l5 which is operatedin turn by the rod IT by means of which it is moved to operative andinoperative positions.

The fixed contact point I2 is adjustable as its base part can be securedin various positions by bolts H9 (Figure 6) which have their heads inthe undercut slots I20 in the face of the housin II. The slots arepreferably arranged as a central vertical slot and two parallelhorizontal slots. When moved horizontally away from the centre line ofthe machine, the lower fixed contact point I2 can be aligned with thepoint M by loosening the clamp joint H8 and the clamp joint l2l and thensecuring said clamp joints when the points have been aligned. Theseadjustments are sometimes necessary in welding pieces that are recessedor otherwise formed in a way to compel such adjustment. The contactpoints are shown in detail in Figures '7 and 8. The contact pointscomprise the tip I8 on the tube I2 and the tip I9 on the tube I4. Thetubes are hollow and have connections and 2| respectively for attachinghose. The tubes have interior pipes 22 in each one. These tubes extendnearly to the terminals and are spaced from the inside walls of 20 thetubes l2 and M to form water passages. On the outer end of each pipe 22is a connection 23. A hose 24 (Figure 3) feeds cool water to one pipe22, in this case the lower one, and a hose 25 conducts the water fromthe tube l2 to the pipe 25 22 in the upper tube l4. Another hose 26conducts the water from the connection 20 to a coolingdevice to whichthe hose 24 is also connected. This provides a circulation of coolingwater to the contact points. The tubes l2 and I 4 are secured to theirrespective arms by resting in a hole 21 in the arm (Figure 8) and a hole28 is tangential to the hole 21. A movable wedge-like block 29 has arounded part that rests against the tube and a screw 30 is used totighten the wedge and consequently the tube. The head 3| of the screwrests. against the bushing 32 and is on the outside of the assembly orthe head 3| can be made large enough to dispense with the bushing 32.This arrangement provides a positive grip on the tubes 12 and I4 andalso allows an easy and ready adjustment of the space between the pointsto provide proper contact on work of various thicknesses. A plate 32represents the work in the drawings.

The transformer that supplies current to the arms l3 and I5 is shown at34 and the secondary coil is connected at 35 to the arm l5 and at 36 tothe arm l3. ,To provide a transformer with higher reactance I make twoturns as shown in Figure 12. The secondary coil 3'! isformed into twolighter turns instead'of one heavy turn. The improved constructiongreatly reduces splashing at the point of weld. This construction whichsplits the secondary to distribute the turns evenly Bill couplingbetween the primary and secondary. The electric circuit will bedescribed in detail hereinafter.

To move the contact arm M and its lever t5 the rod I1 is movedvertically. The rod ii is connected at the bottom to the rear end of anarm 38 secured to rock with a sleeve 39 to which a it is clamped as bythe split collar 49. The sleeve 39 is rotatable freely on the shaft M.The sleeve 39 is fastened as by the screw ii to the collar 19 with aprojection 54 on it (see Figures 3 and 5). The foot treadle 45 rocks theboss 65 when it is operated. This boss d5 comprises three parts a sleevell in which the rod Gil of the treadle is adjustable, a centre ring 59and a bottom mem ber 59 which includes a collar 5i fitting loosely onthe shaft l i. These three members that comprise the boss are heldtogether by a central bolt,

52. The central ring d9 has a finger 53 that can be swung to the left torest on the projection i or swing to the right to rest on a similarprojection to be described hereinafter.

The drawings show it in this latter position. To turn the ring 69 andits finger the bolt 52 is unscrewed and the ring partly rotated and thenthe parts are again clamped. Roughened or toothed construction as at 56can be used to hold the parts against shifting. It will be evident thatwhen the finger 59 is over the projection M and the treadle is pusheddown, the collar G3 is rocked and it rocks the sleeve and the arm andthis in turn raises the rod ill and the lever 95 and its arm I5 areswung to lower the contact point IIQ. When the treadle is released theparts return to normal position through operation of the spring 55abutting on the collar 55 on the rod it and on the arm 5? projectingfrom the back of the standard ill.

This adjustment of the ring 39 and its finger 53 provides for a singlecontact for each operation of the foot treadle.

The mechanism for operating the contact l2 repeatedly as long as thefoot treadle remains down is operated when the finger 53 is situated asin Figure 3 resting on the projection 55 on the collar 56. The collar 56is secured as by a screw 51 to the shaft II which is secured at theother end as by the screw 58 to the arm 59. The arm 59 is provided atits outer end with a link 50 to'which it is pivoted. This link ispivoted at its upper end to one end of a right angled arm 6I which is inturn pivoted as at 62 to the standard I0. This arm 6| carries thedriving gear 63, the intermediate gear 64 and the driven gear 65 securedon the shaft 66 to which is also fastened the cam 61. The rod I! has aroller 68, or its equivalent to rest on the cam and as the cam rotatesthe rod I1 is moved up and down and contacts are repeatedly broughttogether while removing the foot from the treadle 45.

\ The gear 63 is driven by shaft 62 on which it is fastened. The shaft62 is driven from the motor 69 mounted on the side of the standard I0.The motor is controlled by the rheostat 10. This motor and its controlis of any conventional kind.

The arm 59 is provided with afront extension I! and normally has itsfront end I2 caught under the nose I3 of the..trip M pivoted at E5 andincluding a foot piece 36 which is held up by a spring TI. Thisarrangement holds the gearing and the cams up by means of the arm 59without the necessity of holding down the treadlc I over the primarywinding enables a much better 45. To start the repeated welding duringwhich the work is shifted, theioot treadle is pushed down. This catchesthe end of the extension II under the trip I4. When the work iscompleted the foot-piece I6 is pushed down, the lever 59 is released,the cam is lowered, as in Figure 9, and the gears and cam work idly, thecam out of contact with the roller 69. The arm 59 and the arm Slit areshown equipped with screws I8 to fix their normal positions.

In order to prevent excess pressure by the contact point i l the rod illis not connected directly to the lever l5 but the pressure istransmitted through the spring l9 which abuts on the adjustable collar99 on the rod ll and also abuts on the bottom side of the lever E5 orits yoke 35 The rod slides freely in the end of the yoke la and has anenlargement ill which engages the lever yoke 65* when the rod ildescends.

The wiring and control of the transformer will be evident from aninspection of the diagram in Figure l3, the detail drawings of theswitch in Figures 10 and 11 and the illustration of its cooperation witha make-and-brealt device shown in the front and side view of themachine.

The make-and-break device, as shown, consists of lever 332 with a forkedend embracing the rod H and pivoted at 93 to the housing M. It is movedby flanges 85 above and below the forked end. A spring 95 is above thelever and abuts on a collar 85. A spring ill is below the lever 32 andabuts on a collar 38 secured on the rod iii. The spring at isconsiderably weaker than the spring 95.

The lever 92 carries a yoke 99 that rocks at its centre at 99 on thelever 92. At each end of the yoke is a contact, one 95 is opposite afixed contact on the housing. The other 99 is opposite a fixed contact90 on the housing. When the lever 92 is raised it completes the circuitbetween the contacts 92 and 94 as the yoke is made of conductingmaterial suitably insulated from the lever 82. The contact 92 isconnected by wire to one of a pair of binding posts 95 and 96 whichreceive the main line wires 9! and 98. The contact 9% is connected bythe wire 99 to the primary coil tilt of the transformer WI which alsoincludes the secondary coil 91 and the core I93. The switch 904 has thecentral post I05 connected by wire I06 to the post 96. The central postI05 makes contact with separated contacts 091 each connected by a wireI08 at spaced points in the primary coil to control the voltage of thesecondary coil by varying the ratio of transformation. In Figures 10 and11 I show a form of switch in which the switch arm I09 secured on thepost I05 is secured to the rotatable knob H which has a pointer Ill toindicate with which of the contacts I01 the arm I09 is connected. Thecontacts I01 have each a looped metal piece H2 and a head H3, betweenwhich the arm I 09 slides to insure proper contact.

The central part of the knob has a chamber in which the spring I I4 isseated. It presses against a fixed abutment I I and also presses againstthe flange H 6 of the arm I09 to keep the contacts with the block orhead I I! of the central post I05 and the terminals II 3 of the contactsI01 tight.

in the operation of the machine the work 92 is placed on the fixedcontact point II. The finger 59 is adjusted either over the projection Hfor single stroke operation or over the finger 55 for intermittentstroking operation from the foot treadle. the rod it is pushed upwardly.The spring I9 is As the foot treadle is depressed compressed and thelever IS, the arm l and the contact point M are moved to operativeposition. After the contacts I2 and M are in welding position the spring81 which has been under increased compression finally overcomes thespring 85 and the lever 82 is moved upwardly to cause the make-and-breakdevice to complete the circuit through the yoke 89 and thus through thetransformer to energize the contacts I2 and I4.

When the treadle is released the rod I I descends, the heavier spring 85overcomes the spring 81, the make-and-break device is opened to open thecircuit and the current is shut-off from the contact points l2 and I4before these contact points are separated.

It will be evident that various changes can be made in the arrangementand form of the parts without departing from the scope of the invention.

The machine is very effective in operation, the welding is done withoutsplashing, the regulation of the circuit is readily accomplished and themachine takes up but little room on the floor of an establishment.

1. In a welding machine. a standard. a movable welding point. a rod bywhich the point is actuated. a sleeve mounted so as to oscillate in thestandard, an arm secured at one end to the sleeve and pivotallyconnected at its other end to the rod, a collar on the sleeve and havinga projection thereon, a shaft arranged to oscillate in the sleeve, andhaving a collar secured thereto with a projection opposite the firstmentioned projection, an arm secured to the shaft, a link secured to theend of the arm. a right-angled arm pivoted to the standard and to theend of the link, a shaft at the turn oft-he right angled-arm, a cam onthe last-mentioned shaft. a driven gear on the same shaft, a roller onthe rod with which the cam is adapted to engage, a train of gearsincluding a driving gear on the right angled arm to operate the cam, atreadle loosely rotatable on the shaft supporting the sleeve and havinga finger, and means for adjusting the finger to selectively engage theprojections of the shaft and the sleeve.

2. In a welding machine, a standard, a movable welding point, a rod bywhich the point is actuated, a sleeve mounted so as to oscillate in thestandard, an arm secured at one end to the sleeve and pivotallyconnected at its other end to the rod, a collar on the sleeve and havinga projection thereon, a shaft arranged to oscillate in the sleeve, andhaving a collar secured thereto with a projection opposite thefirst-mentioned projection, an arm secured to the shaft, a link securedto the end of the arm, a right-angled arm pivoted to the standard and tothe end of the link, a shaft at the turn of the right-angled arm, a camon the last-mentioned shaft, a driven gear on the same shaft, a rolleron the rod with which the cam is adapted to engage, a train of gearsincluding a driving gear on the right-angled arm to operate the cam, atreadle including a bottom member loosely mounted on the shaft in thesleeve, a

sleeve, a centerring having a finger to engage either of theprojections, and a bolt central to the ring for adjustably securing thering in place, whereby the treadle can be engaged by one operating meansand disengaged from the other.

3. In a welding machine, a standard, a movable welding point, a rod bywhich the point is actuated, a sleeve mounted so as to oscillate in thestandard, an arm secured at one end to the sleeve and pivotallyconnected at its other end to the rod, a collar on the sleeve and havinga projection thereon, a shaft arranged to oscillate in the sleeve, andhaving a collar secured thereto with a projection opposite the firstmentioned projection, an arm secured to the shaft, a link secured to theend of the arm, a right-angled arm pivoted to the standard and tothe endof the link, a shaft at the turn of the right-angled arm, a cam on thelast-mentioned shaft, a driven gear on the same shaft, a roller on therod with which the cam is adapted toengage, a train of gears including adriving gear on the right-angled arm to operate the cam, a treadleincluding a bottom memberloosely mountedon the shaft in the sleeve. asleeve, a. rod secured in the sleeve and having a foot portion, a centerring having a finger to engage either of the projections, and a boltcentral to the ring for adjustably securing the ring in place, wherebythe treadle can be engaged by one operating means and disengaged fromthe other, an extension on the arm, and a trip for engaging theextension to hold the arm and its associated parts in operativeposition.

CHAS. EISLER.

